Speaking apparatus.



PATENTED DEC. 8, 1903.

P. VOGEL. I SPEAKING APPARATUS, APPLICATION MAR IQ, 1903.

N0 MODEL.

EJJEJ. w bmw UNITED STATES Patented December 8, 1903.

PAUL VOGEL, OF BERLIN,GERMANY.

SPEAKING APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 746,609, dated December8, 1903. Application filed March 19, 1993. Serial No. 148.638. (Nomodel.)

To (ZZZ whom it may concern.-

Be it known that I, PAUL VoeEL, a subject of the Emperor of Germany,residing at Her lin, Germany, have invented certain new and usefulImprovements in Speaking Apparatus, of which the following is aspecification.

My invention relates to speaking appara tus in which the sound-waves areengraved in the usual manner of phonographs, but on the inner side ofthe hollow body or recordcylinder.

The device is illustrated in the accompanying drawings, in which- Figure1 is a front elevation of the device. Fig. 2 is a plan showing'asectionof the roller space.

- In the drawings, a is the stand, I) the drum for carrying the body orrecord-cylinder, and c the clockwork for driving the device, 2 being therecord cylinder of body containing the sound-waves.

The reference letters 01 to d represent grooved rollers suitablyattached to the stand a and which are adapted to carry the drum.

1) and to form a-roller-bearing for the same.

Secured to the rear of the drum 1) is a spurgearing e, which meshes witha gear f, driven by the clockwork. In thehollow space of the interior ofthe drum a spindle g projects. This spindle is screw-threaded and issecured to the clockwork, so as to be rotated thereby.

Guiding-rods h and 'i are secured to a stationary part of the clockworkc and project into the space in the interior of the drum. The usualmembrane sliding carriage 1, having sliding connection with the rods hand z, is also provided. This carriage is operated by means of athreaded segment is, carried by a spring Z, which is connected to one ofthe sliding connections of the carriage. The screwthreads of the segmentengage with the threads of the spindle g. Thus as the latter rotates thesegment is moved forward, carrying with it the carriage.

By the employment of the inner surface of the cylinder a more exacttouching of the cylinder by the reproduction-pointer is obtained than byhaving the sound-Waves on the outer side of the cylinder. Then,again,the grooves are protected from damage in packing, and therollerdrum does not act as a wedge or in a spreading manner, as in theold style of device, but as a hoop, tending to keep the cylindertogether. I

I claim as my invention In an apparatus for reproducing sounds, a hollowrotating body having an inner surface for carrying the record thereon,and stylus mechanism operatively engaging said inner surface.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

PAUL VOGEL.

-Witnesses HENRY HASPER, WOLDEMAR HAUPT.

